The guy is an idot as well as a jerk. If he was in so much of a hurry, he would have showed his receipt and spent 10 seconds waiting on the guy to verify the purchase. But, since he's so damn cool he knows his rights, he wasted what was probably 10-50 times more time than he could have.
But, no, he wanted everyone to know he's cool and knows his rights. He can walk out being an ass and not having to bother with the receipt checker. Instead, he wanted to be rude and disrespectful to others and cause a scene. If I were one of the workers, I would have gotten the license tag number and then tipped the police off that it was stolen. That would have probably wasted some more of his time in the future.